Glossary: Secure Infrastructure and Zero Trust

Common port numbers

Also written: well-known ports, port numbers

Numbers that identify network services: 21 FTP, 22 SSH/SFTP/SCP, 69 TFTP (UDP), 443 HTTPS and TLS VPNs, 500 and 4500 IPsec (UDP), 990 implicit FTPS, 3389 RDP, 5432 PostgreSQL, 5900 VNC, 9100 raw printing, 51820 WireGuard (UDP). Firewall rules allow or block traffic by these numbers.